Cleanup _Rb_tree_impl in versioned namespace

[François Dumont]

Hi

     Jonathan proposed to leverage on versioned namespace to do some abi 
breaking change so here is one simple on _Rb_tree_impl.

     I wonder if versioned namespace should be bump for this change. Do 
we really have any kind of abi compatibility for versioned namespace ? I 
guess not but so why a versioned namespace ?

     Tested under x86_64 linux, ok to commit ?

     Note that I also plan some white spaces cleanup in the patch that I 
have hidden by using git diff -w.

François

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